Loans - Summary of Term Loans by Origination Year (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,424,770
2019	522,785
2018	295,957
2017	170,849
2016	57,935
Prior	43,949
Financing Receivable, Converted	14,578
Revolving Loans	609,082
Total	3,139,905
Commercial and industrial | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,378,251
2019	499,865
2018	289,283
2017	155,369
2016	30,317
Prior	41,477
Financing Receivable, Converted	14,000
Revolving Loans	524,025
Total	2,932,587
Commercial and industrial | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	41,834
2019	11,685
2018	3,421
2017	11,619
2016	22,835
Prior	105
Financing Receivable, Converted	0
Revolving Loans	63,198
Total	154,697
Commercial and industrial | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	4,685
2019	11,235
2018	3,253
2017	3,861
2016	4,783
Prior	2,367
Financing Receivable, Converted	578
Revolving Loans	21,859
Total	52,621
Commercial Real Estate-Investor Owned Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	345,261
2019	283,318
2018	190,141
2017	119,947
2016	151,655
Prior	163,352
Financing Receivable, Converted	4,969
Revolving Loans	33,539
Total	1,292,182
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	338,563
2019	277,705
2018	180,534
2017	119,492
2016	138,823
Prior	158,678
Financing Receivable, Converted	4,969
Revolving Loans	33,539
Total	1,252,303
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,634
2019	5,115
2018	1,245
2017	0
2016	12,584
Prior	3,609
Financing Receivable, Converted	0
Revolving Loans	0
Total	29,187
Commercial Real Estate-Investor Owned Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	64
2019	498
2018	8,362
2017	455
2016	248
Prior	1,065
Financing Receivable, Converted	0
Revolving Loans	0
Total	10,692
Commercial Real Estate-Owner Occupied Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	203,348
2019	190,148
2018	85,066
2017	78,128
2016	52,222
Prior	77,372
Financing Receivable, Converted	2,715
Revolving Loans	46,705
Total	735,704
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	192,320
2019	184,427
2018	80,269
2017	72,465
2016	43,855
Prior	68,277
Financing Receivable, Converted	2,715
Revolving Loans	43,882
Total	688,210
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	10,628
2019	5,213
2018	259
2017	4,851
2016	8,367
Prior	4,946
Financing Receivable, Converted	0
Revolving Loans	2,823
Total	37,087
Commercial Real Estate-Owner Occupied Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	400
2019	508
2018	4,538
2017	812
2016	0
Prior	4,149
Financing Receivable, Converted	0
Revolving Loans	0
Total	10,407
Construction Real Estate Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	150,492
2019	152,879
2018	92,351
2017	29,532
2016	11,676
Prior	12,281
Financing Receivable, Converted	0
Revolving Loans	25,516
Total	474,727
Construction Real Estate Portfolio Segment [Member] | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	147,206
2019	152,879
2018	77,811
2017	18,076
2016	11,676
Prior	11,899
Financing Receivable, Converted	0
Revolving Loans	25,516
Total	445,063
Construction Real Estate Portfolio Segment [Member] | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	3,064
2019	0
2018	14,540
2017	11,456
2016	0
Prior	348
Financing Receivable, Converted	0
Revolving Loans	0
Total	29,408
Construction Real Estate Portfolio Segment [Member] | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	222
2019	0
2018	0
2017	0
2016	0
Prior	34
Financing Receivable, Converted	0
Revolving Loans	0
Total	256
Residential Portfolio Segment
Financing Receivable, Credit Quality Indicator [Line Items]
2020	39,349
2019	32,024
2018	21,727
2017	17,643
2016	32,917
Prior	110,771
Financing Receivable, Converted	921
Revolving Loans	65,513
Total	320,865
Residential Portfolio Segment | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	38,603
2019	30,290
2018	20,571
2017	17,630
2016	32,011
Prior	105,538
Financing Receivable, Converted	644
Revolving Loans	64,662
Total	309,949
Residential Portfolio Segment | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	212
2019	852
2018	828
2017	0
2016	0
Prior	2,122
Financing Receivable, Converted	277
Revolving Loans	801
Total	5,092
Residential Portfolio Segment | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	534
2019	882
2018	328
2017	13
2016	906
Prior	3,111
Financing Receivable, Converted	0
Revolving Loans	50
Total	5,824
Other
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,762
2019	13,512
2018	20,135
2017	554
2016	3,567
Prior	31,242
Financing Receivable, Converted	9
Revolving Loans	52,283
Total	145,064
Other | Pass (1-6)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	23,762
2019	13,492
2018	20,109
2017	551
2016	3,567
Prior	28,539
Financing Receivable, Converted	0
Revolving Loans	52,276
Total	142,296
Other | Watch (7)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	1
2018	5
2017	0
2016	0
Prior	2,685
Financing Receivable, Converted	0
Revolving Loans	1
Total	2,692
Other | Classified (8 & 9)
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0
2019	19
2018	21
2017	3
2016	0
Prior	18
Financing Receivable, Converted	9
Revolving Loans	6
Total	$ 76